Electrical winding.



L. W. CHUBIL ELECTRICAL WINDING.

APPLICATION FILED mu :2. I911.

1,264,272, Patented A pr. 30, 191 5.

WITNESSES; INVENTOR 440f Lew/'5 5 07111;!)- 9 ATTORNEY some specific frequency, said UNITED STATES PATEN T OFFICE.

LEWIS W. CHUBB, OF PITTSBURGH,

ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA. ELECTRICAL WINDING.

Specification of Letters Patent.

Patented Apr. 30, 1918.

Application filed July 12, 1917. Serial No. 180,068.

To all whom it may concern:

Be it known that I, Lnwrs W. CHUBB, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a. new and useful Improvement in Electrical indings, of which the following is a specication.

My invention relates to electrical windas the windings of conse uent free om froin internal resonant stur ances.

further ob ect of my invention is to pro- Vlde means whereby, having fixed the resonant period of a winding, current of such reduce resonance therein, may be substantially prevented from flowto. n

n the accompan 'ng drawing, Figure 1 is a side view, P81151111? in section and partially in el a transformer, em-

' and Fig.

ther illustrating my invention.

It is well known that every electrical winding has inherent inductance and capacitance unless ecially arran ed to eliminate these efi'ects ft, therefore, ollows that, for v winding is resonant and may produce far higher p0 tials therein than are ap sulting in disturbance of t e circu t an liability to dielectric failure. *l

f the inductance and capacitance of a windingare unifo mly distributed there through, said winding will otentials are exereof where they may be dischargedor otherwise elimina ed y suitable protective apparatus.

If, onthe other hand, a winding is tructurally ductauce or capacitance thereofjs not uniformly distributed, reducing non-uniform erein, resonant potentials may be developed within certain portions of the winding without appearing at the terminals thereof. Potentia s of this character may be highly disastrous in their resonant as a discontinuous so that either the in-.'

effects and yet be extremely dilficult to elimiate.

tailed my invention, I s ow a transformer core- Fig. 1, said core carrying two windings 3 and 4. The winding 4 18 shown as com rising three groups of flat or-pan-cakecoi s 5, 6 and 7 and the winding 3 is shown as comprising four similar pan-cake coils interspersed therebetween. I have shown my invention only as applied to the winding 4, although it may be equally well applied to the winding 3 and to all windings of a similar nature such, for example, as the field windings of a dynamo-electric machine. e two lower coils of the coil group 5 are designated, re ectively, as 8 and 9, and the two upper coifi of the'coil group 6 are desig nated, res eetively, as 10 and 11. All of the go several groups are shown connected, in series relation with each other. There is a relatively high capacitance between the coils 8 and 9 because of their close capacitly of the diar relatively the coils 10 relatively low specific inductive capacity of said ielectric.

lcs

i 9 and the plate 12 \Vitli the structure described up to this point, there would be abrupt electrical discontinuity in the winding 4 because of this relatively low capacitance and a consequent liability to the development of resonant potentials Within the winding.

In order to prevent the aforementioned action and to render the energ uniform throughout the win ing 4, I dispose a layer of conducting material 12 adjacent to the coil 9 and a similar layer of conducting material 13 adjacent to the coil 10. Said layers of conducting material are then connected as by a jumper 14. The coil 9 with the conducting layer 12 thus produces a condenser which is arran ed in series with the similar condenser pro uced by the conducting layer 13 and the coil 10. By causing the capacitance of each of the auxiliary condensers thus provided to be substantlally twice that of the condenser produced b two adjacent coils in the same coil group, t e resultant capacitance between the coils 9 and 10 may be rendered substantially equal to that between two adjacent coils in the same coil grou in accordance with the well known ru e that the joint capacitance of series-connected condensers is the reciprocal of the sum of the reciprocals of therespective capacitance.

Thus, in Fi 2, the capacitance between the coils 8 an 9 may be designated by C, the capacitance between the coils 10 and 11 by C while the capacitance between the coil as well as that between the coil 10 and the plate 13 is represented by 20, thus rendering the equivalent capactancc between the coils 9 and 10 equal to A similar arrangement is provided between the core groups 6 and 7, thus rendering the distribution of energy substantially continuous throu hout the winding 4 and causing said win ing to be resonant as a whole to a predetermined frequency other than the operating frequency of the transformer. I may then provide a parallel resonant circuit in series with the winding 4 as shown at 15, said parallel resonant circuit bein tuned to said predetermined frequency o the winding 4. The flow of current of this frequency into the is thereby prevented and the production of abnormal resonant potentials therefore, substantially prevented under operating conditions.

While I have shown my invention'in one of its preferred forms, it will be obvious to those skilled in the art that it is susceptible of various minor without departing from the spirit thereof and I desire, therefore, that only such limitations shall be placed thereupon as' are imposed by the prior art or as are set forth in the appended claims.

changes and modifications I I claim as my invention:

1. The combination with an electrical winding comprising a plurality of spaced groups of individually spaced coils, the )acing between said groups differing from t e spacing between said coils, of means for rendering the capacitance between the immediately adjacent coils of two adjacent groups substantially equal to that between two adjacent coils of agroup.

The combination with an electrical winding comprising a plurality of spaced groups of individually space coils, the spacing between said groups differing from the spacing between said coils, of means for providing a condenser having an end coil of one group as one plate thereof, means providing an additional condenser having the immediately adjacent coil of the neighboring group as one plate thereof, and means for connecting said two condensers in series relation.

3. The combination with an electrical winding comprising a pluralit of spaced grou s of individually spaced coils, the spacing between said groups the spacing between said coils, of means for providing a condenser havin an end coil of one group as one plate t ereof, means providing an additional condenser having the immediately adjacent coil of the neighboring group as one plate thereof, and means for connecting said two condensers 111 series relation, the joint capacitance of said two condensers daily the same as that between two adjacent coils in the same group;

4. The combination with an electrical winding comprising a plurality of spaced groups of individually spaced coils, the spacing between said groups difl'ering from the spacing between said coils of a" layer of conducting material mounted adjacent to an end coil in one group, of conducting material mounted adjacent to the immediately adjacent end coil of the next group, an conducting means said two conducting layers.

5. The combination with an electrical winding comprising a pluralit of spaced groups of individually space coils, the spacing between said groups difiering from t e spacing between said coils, of a layer of cond'uctin material mounted adjacent to an end 001 in one group, an additional mounted adjalayer of conducting material vent to the immediately adjacent end coil of the next (group, and conducting means hetweensai two conducting layers.

6. The combination with a structurally discontinuous electrical winding, of means for rendering said windin electrically continuous, whereby said wining tends to resonate as a who e at a specific frequency, a source of variable frequency connecte between difi'ering from an additional layer thereto and a parallel resonant circuit tuned to said specific frequency and connected in circuit with said source and said winding, whereby currents of said specific frequency are prevented from reachin said Winding.

'7. The combination wit a winding adapted to be resonant only at a predetermined frequency, of a source of energy variable frequency connected means inserted in circuit with said winding and adapted to prevent the flow of energy of said predetermined frequency to same winding.

8. The combination with a structurally discontinuous electrical windin of means for rendering said windi elec rically continuous, whereb said win in fiends to resonate as a who e at a specific requency, a source of variable frequency thereto and means in circuit with said winding arranged to prevent the flow of energy of said specific frequency thereto.

e combination with an electrical ding comprising a plurality of unequally of inter-connected conducting certain of said coils, the mutual ca acitance between each a jacent pair of coi s is in proportion to the inductance thereof and said windin resonant, as a whole, to a is adapted to be predetermined frequency, and means in circult with said coil adapted to vrevent the flow of energy of said predetermined. frequency thereto. w

n testimony whereof, I have hereunto subscribed my name this 30th day of June,

LEWIS W. CHUBB. 

